What is the purpose of the long run pin on a 115 V electrical plug?

The long run pin on a 115 V electrical plug is designed as a safety ground. Its primary function is to provide a pathway for electricity to safely return to the ground in the event of a fault, which helps to prevent electric shock and reduces the risk of electrical fires. This grounding mechanism is essential for protecting both people and equipment, as it ensures that in the case of a short circuit or an equipment failure, the excess electrical current has a safe route to disperse.

Removing or bypassing the ground pin compromises this safety feature, significantly increasing the risk of electric shock or damage to the equipment. It is critical for anyone working with electrical systems to understand the importance of maintaining this safety ground intact.